function fn(username,...xxx) {
  // console.log(username,age,rest)
  console.log(username,xxx)
}

fn("张三", 21, "男", "积云教育");

// let arr1 = ["北京", "上海"];
// let arr2 = ["广州", "深圳"];

// arr1.push(...arr2);
// console.log(arr1)